NFL Free Agency 2013: Unsigned Players That Can Improve Any Team

It is now the fourth day of free agency in the NFL, and many of the top available players have already been signed. There are some impact starters that are still free agents that could surely bolster any NFL squad.

Even though many of the most coveted free agents have decided on a destination, there are still some star players on the market.

Much attention has been placed on free-agent wide receivers this offseason, but by now most of the big-name wideouts have been scooped up. However, one star receiver still remains.

Greg Jennings, WR

Now that Wes Welker, Mike Wallace and Dwayne Bowe have locked up deals, Jennings stands as the top receiver left on the market.

Jennings may be coming off a disappointing season caused by a groin injury, but it is tough to overlook his past success with the Green Bay Packers.

During his seven seasons with the Packers, Jennings corralled 6,537 receiving yards and 53 touchdowns. Before his 2012 campaign, he made the Pro Bowl in back-to-back seasons.

In the Packers' 31-25 victory over the Pittsburgh Steelers in Super Bowl XLV, Jennings caught two touchdown passes.

He injured his groin in the team's season opener and only played in eight games last season. That injury may cause some teams to pass on the receiver.

The Minnesota Vikings are heavily considering Jennings, according to NFL.com. He would be a huge addition to the Vikings or any other NFL team.

Ed Reed, S

Ed Reed has been one of the most exciting defensive backs in the NFL since joining the Ravens in 2002. He is an incredible playmaker and added a Super Bowl victory to his resume in February.

In 11 seasons with Baltimore, he has compiled 606 tackles and 61 interceptions. Reed has also scored eight touchdowns for the Ravens as a safety and as a punt returner.

A number of teams would love to add the veteran defensive back to their roster. Though his career will come to a close sooner than later, his presence can still help any secondary in the league.

The Houston Texans are making a strong push for Reed, according to NBC Sports, but no deal has been put in place just yet.

Jake Long, OT

The former No. 1 pick by the Miami Dolphins has been great in his first five seasons. Long has made the Pro Bowl four times and has started in 74 games.

Nick Laham/Getty Images

Long could help so many teams.

He is one of the top linemen available on the free-agent market. Offensive tackle is an extremely important piece to an offense and many teams could use a protector like Long.

The St. Louis Rams have shown interest in Long, but the St. Louis Post-Dispatchrecently reported that he has not come to terms with the Rams.

The Dolphins would still like to keep him and are making an attempt to bring back the 6'7" lineman, according to USA Today. Long would improve any offense in the league with his blocking ability.

The past few days of free agency have been quite exciting and the destinations of these three players will be very intriguing.